Also, have you connected switches and a potentiometer to the unit to control the output voltage/frequency, or alternatively, have you enabled the MOP functionality in the BOP? The MOP is disabled by default (in favour of analogue inputs). Unless of course it's the USS variant, in which case the analogue inputs are actually RS-485 signals and used to control the output if MOP is turned off. (user manual PP39)

The BOP not working is a serious concern. You won't be able to get it to do much without the BOP, or a serial connection (using the PC to Inverter connection kit). This may be a silly question (slap me if it is - I have to ask), but you do clip the BOP into the proper location in the centre of the unit, not where it is in that picture of yours?

By the way, is yours actually the analogue or the USS version? If the latter, the pot won't do anything - you'll need to use an RS-485 connection to send commands to it. The BOP should still function though.

yes its connected, i think i may have found the problem, the unit dates to 2005 (bop) not sure if its compatible with this inverter. kinda crossed my mind when i first got it as it doesnt fit very well onto the inverter, looks like it would fit but had to take the board out of the bop and fit it into the inverter connector.

not really sure what version it is analog or uss version, but after taking the lid off it looks to be both

im assuming you can flip between both somewhere in the bop, i will get another bop and report back accordingly.

took the unit apart to have a poke about seems the suppy circuit is ok cant really check anything else so im amusing the unit is dead, very unusual never came across a faulty siemens inverter (worked for many years in lifts)

ive got another siemenss inverter today which works fine with both bop's old and new.